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Precise measurement of the depolarization ratio from photoacoustic Raman spectroscopy
Author(s) -
Yu Yuanqin,
Lin Ke,
Zhou Xiaoguo,
Wang Hua,
Liu Shilin,
Ma Xingxiao
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1754
Subject(s) - depolarization ratio , raman spectroscopy , depolarization , photoacoustic spectroscopy , photoacoustic imaging in biomedicine , polarization (electrochemistry) , spectroscopy , laser , chemistry , optics , analytical chemistry (journal) , physics , medicine , chromatography , quantum mechanics , endocrinology
A new method for the accurate determination of the Raman depolarization ratio is reported with an improved setup for photoacoustic Raman spectroscopy (PARS). The precise measurement is achieved by measuring the dependence of the acoustic signal intensity on the cross‐angle between the polarizations of two incident laser beams. We demonstrate this sensitive and simple method with several gaseous molecules, such as CH 4 and H 2 . The measured results of depolarization ratios agree well with the theoretical values with an upper error limit of ± 0.005, which is comparable to that with polarization‐resolved CARS spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd.